Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with agraphical user interface, showing our new design and depicting a firstembodiment of the graphical user interface.

FIG. 2 is a front view depicting a second embodiment of the graphicaluser interface.

FIG. 3 is a front view depicting a third embodiment of the graphicaluser interface; and,

FIG. 4 is a front view depicting a fourth embodiment of the graphicaluser interface.

The perimeters of the underlying display screen or portion thereof andthe graphical user interface are understood to be flush.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.